Otto m



(No Model.)

0.M. MATTPELDT su H. 1H. LURSSBN;

BXPANSIONGBAR WHEEL.

.Patented sept. 29, 1896.

Tijyl.,

wlvassss 'UNITED STATES OTTO M. MATTFELDT AND HERMAN H. LURSSEN, OFMOUNT VASHINGTON,

MARYLAND.

EXPANSION GEAR-WHEEL.

SPECIFICATION forming part of Letters Patent No. 568,623, datedSeptember 29, 1896.

' s Application nea May 1e, 1896. serrare. 592,036. (Nomodei.)

To all whom it may concern.:

Be it known that we, OTTO M. MATTFELDT and HERMAN H. LURssEN, citizensof the United States, residing at Mount Washing ton, in the county ofBaltimore and State of Maryland, have invented certain new and usefulImprovements in Expansion Gear- Wheels, of whichV the following is aspecilication.

This invention relates to improvements in expansion-wheels fortransmitting power.

The invention is adapted for both pulleys and sprocketwheels- In orderthat the invention may be clearly understood, reference is now' made tothe accompanying drawings, in which Figure l is a side view showing twopulleys made according to our invention and mechanism for effectingtheir expansion and contraction. Fig. 2 is an interior view of one ofthe pulleys, showing the operative parts.

.- side plates A A.

One side of the pulley is removed to give this interior view. Fig. 3shows two views of the master bevel-pinion. Fig. 4 is a diametri'calsection of the pulley on a shaft. Fig. 5 is an edge view of the pulley.Fig. 6 is a side view of a sprocket-wheel. d

The wheel or pulley has two circular fiat One of these may be made intwo sections joined on a diametrical line. At the center these plateshave a hole for the shaft B, and between the two plates and concentricwith the center hole is a ring C, which7 in the present instance, ishexagon-shaped and has six bolt-holes a. Bolts b are passed through thesaid two plates and through the holes ain the ring, and thereby theparts are firmly held together. On their inner faces the circular platesA A have a number of radial guides, each consisting of two parallelblocks or lugs c c. In the present instance there are six pairs of theseguides, though there may be four or five instead of six. A numberv ofsegmental rim-pieces D, in the present instance six, are employed. Eachsegment has a radial inward-pointing arm d, which ts in the guidesformed by the blocks c c and is movable therein. Each of these arms dhas a screw-threaded socket e, into which one of the screws j' enter.These screws have a round neck which ts and turns in a hole or bearingin the said ring C, so that the screw can revolve, but not advance, andthe inner end of each screw has a bevel-pinion g. It will be seen,therefore, that six small bevel-pinions g are inside of said ring O. Amaster bevel-pinion F has a hollow hub h, through which the main shaft Bextends. This master-wheel engages with all of the six pinions g, andwhen the masterwheel is turned loosely around the shaft it revolves saidpinions and turns all of the screws f, and thereby causes the segments Dto expand or contract, accordingto the direction the screws turn.

The wheel or pulley is made fast to the shaft B by a flanged collar G onthe shaft, which is screwed to the circular side plate A and isprevented from turning on the shaft by well-known suitable means, suchas a key and groove or a set-screw t'.

The hub of the bevel masteiewheel F projects through the center hole ofthe said plates A' to the outside, and the exterior part of said hub isprovided with a pinion j. The mechanism for turning the master-wheeltherefore connects with the outside pinion.

In Fig. l two of our expansion-pulleys are shown, one larger than theother, and connected by a' belt lc. Above each pulley is a segment-rack.The one at the large pulley is designated l-I and the one at the smallpulley H. Each segment-rack engages with' the pinion j on themaster-wheel of one of the pulleys, and each has an arm Z Z', which ispivoted at m m', respectively, to a suitable bar or other stationarypart. (Not shown.) Thus each segment-rack hangs pendent from its pivotand can swing.

lt is proper to state that while the two exA parisien-pulleys shown inFig. l have the same construction illustrated in Fig. 2 they differ inone respect, namely, the screws f of one pulley are threaded in theusual righthand fashion, while the screws of the other kpulley arethreaded left hand. This reverse manner of threading the screws is for apurpose hereinafter mentioned. A rod l connects the two pivotedsegment-racks. The arm of one of the racks has an extension forming ahandle or lever n by which to swing the rack and force its teeth to acton and turn the pinion and master-wheel, and thereby turn all the screwsf in the Wheel and change the position of all of the rim-segments D. Themovement of the handle or lever n Will shift both segment-racks and thussimultaneously change the adjustment of the rim-segments of both Wheels,and in View of the provision of having the screws f of one pulleyreversely threaded from those on the other pulley one Wheel will beexpanded and the other Wheel contracted.

To may apply our new and improved construction to either belt -pulleysor chainwheels, like the sprocket shown in Fig. G, and We may apply theimprovements to any purpose or to any piece of machinery for which it issuited.

Having thus described our invention, what we claim as new, and desire tosecure by Let ters Patent, is- 1 The combination of the tWo side plateseach having a central hole; a ring between the said two plates andconcentric with said center holes; bolts through the ring securing thesaid plates together; a number of segment rim-pieces each having aninward screwthreaded socket; a :number of screws each fitting in one ofthe sockets and having a bearing in the said ring so as to revolve butnot advance and each screw provided on its inner end and inside of saidring with a pinion; and a master-pinion engaging all of saidscreivpinions and having a lateral hub through which a shaft extends,said hub projecting outside of one of the side plates.

In testimony whereof We aflix our signa tures in the presence oi' twoWitnesses.

OTTO M. MATTFELDT. HERMAN Il, LURSSEN. Witnesses:

)HARLES B. MANN, Jr., LEE I. VAN HORN.

